National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds in the North-Central U.S.

A prolonged atmospheric river will continue impacting the Pacific Northwest with heavy rainfall which has lead to areas of urban and river flooding along with gusty winds into Thursday. A clipper will bring heavy snow, some mixed wintry precipitation, and gusty to high winds across the northern Plains, Upper Midwest, and the Great Lakes into Thursday morning. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

67°F

19°C

Humidity 27%
Wind Speed SW 15 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 9 Dec 1:56 pm CST
Extended Forecast for

4 Miles SW San Marcos TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 67. South southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 45. Southwest wind around 10 mph.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 44. North northeast wind 5 to 10 mph.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. North wind around 5 mph becoming south in the afternoon.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 52. South southwest wind around 5 mph.

    Low: 52 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. South wind around 5 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 67. South southwest wind around 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 45. Southwest wind around 10 mph.
Wednesday
Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 44. North northeast wind 5 to 10 mph.
Thursday
Sunny, with a high near 69. North wind around 5 mph becoming south in the afternoon.
Thursday Night
Partly cloudy, with a low around 52. South southwest wind around 5 mph.
Friday
Partly sunny, with a high near 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 59. South wind around 5 mph.
Saturday
Partly sunny, with a high near 78. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 55.
Sunday
Mostly cloudy, with a high near 65.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
A 20 percent chance of showers. Mostly cloudy, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
12:44 pm CST Dec 9, 2025
Forecast Valid:
2pm CST Dec 9, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation